Scott Johnson of GNUveau Networks has developed a solar-powered Internet "hub" system (running Ubuntu GNU/Linux) that he builds to order in his Daytona Beach, Florida, home.
Here is a video about his solar powered system.
His objective is to bring computers and the Internet to places that have no connectivity, no phone service, and no electricity. This is no pipe dream. There are real SolarNetOne installations running in Africa right now, providing wireless connectivity and "Internet Cafe" access to hundreds of people. The system uses off-the-shelf hardware that Scott modifies to run on 12V -- and to use a lot less power than the stock versions. As Scott says, in solar-powered computer installations, "The Watt is king."